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<a name="cairo-Error-handling"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="cairo-Error-handling.top_of_page"></a>Error handling</span></h2>
<p>Error handling — Decoding cairo's status</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="cairo-Error-handling.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">const <span class="returnvalue">char</span> *
</td>
<td class="function_name">
<a class="link" href="cairo-Error-handling.html#cairo-status-to-string" title="cairo_status_to_string ()">cairo_status_to_string</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cairo-Error-handling.html#cairo-debug-reset-static-data" title="cairo_debug_reset_static_data ()">cairo_debug_reset_static_data</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="cairo-Error-handling.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody><tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="cairo-Error-handling.html#cairo-status-t" title="enum cairo_status_t">cairo_status_t</a></td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="cairo-Error-handling.description"></a><h2>Description</h2>
<p>Cairo uses a single status type to represent all kinds of errors.  A status
value of <a class="link" href="cairo-Error-handling.html#CAIRO-STATUS-SUCCESS:CAPS"><code class="literal">CAIRO_STATUS_SUCCESS</code></a> represents no error and has an integer value
of zero.  All other status values represent an error.</p>
<p>Cairo's error handling is designed to be easy to use and safe.  All major
cairo objects <em class="firstterm">retain</em> an error status internally which
can be queried anytime by the users using cairo*_status() calls.  In
the mean time, it is safe to call all cairo functions normally even if the
underlying object is in an error status.  This means that no error handling
code is required before or after each individual cairo function call.</p>
</div>
<div class="refsect1">
<a name="cairo-Error-handling.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="cairo-status-to-string"></a><h3>cairo_status_to_string ()</h3>
<pre class="programlisting">const <span class="returnvalue">char</span> *
cairo_status_to_string (<em class="parameter"><code><a class="link" href="cairo-Error-handling.html#cairo-status-t" title="enum cairo_status_t"><span class="type">cairo_status_t</span></a> status</code></em>);</pre>
<p>Provides a human-readable description of a <a class="link" href="cairo-Error-handling.html#cairo-status-t" title="enum cairo_status_t"><span class="type">cairo_status_t</span></a>.</p>
<div class="refsect3">
<a name="cairo-status-to-string.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>status</p></td>
<td class="parameter_description"><p>a cairo status</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="cairo-status-to-string.returns"></a><h4>Returns</h4>
<p> a string representation of the status</p>
</div>
<p class="since">Since: 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cairo-debug-reset-static-data"></a><h3>cairo_debug_reset_static_data ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
cairo_debug_reset_static_data (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>Resets all static data within cairo to its original state,
(ie. identical to the state at the time of program invocation). For
example, all caches within cairo will be flushed empty.</p>
<p>This function is intended to be useful when using memory-checking
tools such as valgrind. When valgrind's memcheck analyzes a
cairo-using program without a call to <a class="link" href="cairo-Error-handling.html#cairo-debug-reset-static-data" title="cairo_debug_reset_static_data ()"><code class="function">cairo_debug_reset_static_data()</code></a>,
it will report all data reachable via cairo's static objects as
"still reachable". Calling <a class="link" href="cairo-Error-handling.html#cairo-debug-reset-static-data" title="cairo_debug_reset_static_data ()"><code class="function">cairo_debug_reset_static_data()</code></a> just prior
to program termination will make it easier to get squeaky clean
reports from valgrind.</p>
<p>WARNING: It is only safe to call this function when there are no
active cairo objects remaining, (ie. the appropriate destroy
functions have been called as necessary). If there are active cairo
objects, this call is likely to cause a crash, (eg. an assertion
failure due to a hash table being destroyed when non-empty).</p>
<p class="since">Since: 1.0</p>
</div>
</div>
<div class="refsect1">
<a name="cairo-Error-handling.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="cairo-status-t"></a><h3>enum cairo_status_t</h3>
<p><a class="link" href="cairo-Error-handling.html#cairo-status-t" title="enum cairo_status_t"><span class="type">cairo_status_t</span></a> is used to indicate errors that can occur when
using Cairo. In some cases it is returned directly by functions.
but when using <a class="link" href="cairo-cairo-t.html#cairo-t" title="cairo_t"><span class="type">cairo_t</span></a>, the last error, if any, is stored in
the context and can be retrieved with <a class="link" href="cairo-cairo-t.html#cairo-status" title="cairo_status ()"><code class="function">cairo_status()</code></a>.</p>
<p>New entries may be added in future versions.  Use <a class="link" href="cairo-Error-handling.html#cairo-status-to-string" title="cairo_status_to_string ()"><code class="function">cairo_status_to_string()</code></a>
to get a human-readable representation of an error message.</p>
<div class="refsect3">
<a name="cairo-status-t.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="enum_members_name">
<col class="enum_members_description">
<col width="200px" class="enum_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-STATUS-SUCCESS:CAPS"></a>CAIRO_STATUS_SUCCESS</p></td>
<td class="enum_member_description">
<p>no error has occurred (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-STATUS-NO-MEMORY:CAPS"></a>CAIRO_STATUS_NO_MEMORY</p></td>
<td class="enum_member_description">
<p>out of memory (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-STATUS-INVALID-RESTORE:CAPS"></a>CAIRO_STATUS_INVALID_RESTORE</p></td>
<td class="enum_member_description">
<p>cairo_restore() called without matching <a class="link" href="cairo-cairo-t.html#cairo-save" title="cairo_save ()"><code class="function">cairo_save()</code></a> (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-STATUS-INVALID-POP-GROUP:CAPS"></a>CAIRO_STATUS_INVALID_POP_GROUP</p></td>
<td class="enum_member_description">
<p>no saved group to pop, i.e. <a class="link" href="cairo-cairo-t.html#cairo-pop-group" title="cairo_pop_group ()"><code class="function">cairo_pop_group()</code></a> without matching <a class="link" href="cairo-cairo-t.html#cairo-push-group" title="cairo_push_group ()"><code class="function">cairo_push_group()</code></a> (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-STATUS-NO-CURRENT-POINT:CAPS"></a>CAIRO_STATUS_NO_CURRENT_POINT</p></td>
<td class="enum_member_description">
<p>no current point defined (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-STATUS-INVALID-MATRIX:CAPS"></a>CAIRO_STATUS_INVALID_MATRIX</p></td>
<td class="enum_member_description">
<p>invalid matrix (not invertible) (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-STATUS-INVALID-STATUS:CAPS"></a>CAIRO_STATUS_INVALID_STATUS</p></td>
<td class="enum_member_description">
<p>invalid value for an input <a class="link" href="cairo-Error-handling.html#cairo-status-t" title="enum cairo_status_t"><span class="type">cairo_status_t</span></a> (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-STATUS-NULL-POINTER:CAPS"></a>CAIRO_STATUS_NULL_POINTER</p></td>
<td class="enum_member_description">
<p><a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> pointer (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-STATUS-INVALID-STRING:CAPS"></a>CAIRO_STATUS_INVALID_STRING</p></td>
<td class="enum_member_description">
<p>input string not valid UTF-8 (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-STATUS-INVALID-PATH-DATA:CAPS"></a>CAIRO_STATUS_INVALID_PATH_DATA</p></td>
<td class="enum_member_description">
<p>input path data not valid (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-STATUS-READ-ERROR:CAPS"></a>CAIRO_STATUS_READ_ERROR</p></td>
<td class="enum_member_description">
<p>error while reading from input stream (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-STATUS-WRITE-ERROR:CAPS"></a>CAIRO_STATUS_WRITE_ERROR</p></td>
<td class="enum_member_description">
<p>error while writing to output stream (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-STATUS-SURFACE-FINISHED:CAPS"></a>CAIRO_STATUS_SURFACE_FINISHED</p></td>
<td class="enum_member_description">
<p>target surface has been finished (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-STATUS-SURFACE-TYPE-MISMATCH:CAPS"></a>CAIRO_STATUS_SURFACE_TYPE_MISMATCH</p></td>
<td class="enum_member_description">
<p>the surface type is not appropriate for the operation (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-STATUS-PATTERN-TYPE-MISMATCH:CAPS"></a>CAIRO_STATUS_PATTERN_TYPE_MISMATCH</p></td>
<td class="enum_member_description">
<p>the pattern type is not appropriate for the operation (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-STATUS-INVALID-CONTENT:CAPS"></a>CAIRO_STATUS_INVALID_CONTENT</p></td>
<td class="enum_member_description">
<p>invalid value for an input <a class="link" href="cairo-cairo-surface-t.html#cairo-content-t" title="enum cairo_content_t"><span class="type">cairo_content_t</span></a> (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-STATUS-INVALID-FORMAT:CAPS"></a>CAIRO_STATUS_INVALID_FORMAT</p></td>
<td class="enum_member_description">
<p>invalid value for an input <a class="link" href="cairo-Image-Surfaces.html#cairo-format-t" title="enum cairo_format_t"><span class="type">cairo_format_t</span></a> (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-STATUS-INVALID-VISUAL:CAPS"></a>CAIRO_STATUS_INVALID_VISUAL</p></td>
<td class="enum_member_description">
<p>invalid value for an input Visual* (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-STATUS-FILE-NOT-FOUND:CAPS"></a>CAIRO_STATUS_FILE_NOT_FOUND</p></td>
<td class="enum_member_description">
<p>file not found (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-STATUS-INVALID-DASH:CAPS"></a>CAIRO_STATUS_INVALID_DASH</p></td>
<td class="enum_member_description">
<p>invalid value for a dash setting (Since 1.0)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-STATUS-INVALID-DSC-COMMENT:CAPS"></a>CAIRO_STATUS_INVALID_DSC_COMMENT</p></td>
<td class="enum_member_description">
<p>invalid value for a DSC comment (Since 1.2)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-STATUS-INVALID-INDEX:CAPS"></a>CAIRO_STATUS_INVALID_INDEX</p></td>
<td class="enum_member_description">
<p>invalid index passed to getter (Since 1.4)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-STATUS-CLIP-NOT-REPRESENTABLE:CAPS"></a>CAIRO_STATUS_CLIP_NOT_REPRESENTABLE</p></td>
<td class="enum_member_description">
<p>clip region not representable in desired format (Since 1.4)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-STATUS-TEMP-FILE-ERROR:CAPS"></a>CAIRO_STATUS_TEMP_FILE_ERROR</p></td>
<td class="enum_member_description">
<p>error creating or writing to a temporary file (Since 1.6)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-STATUS-INVALID-STRIDE:CAPS"></a>CAIRO_STATUS_INVALID_STRIDE</p></td>
<td class="enum_member_description">
<p>invalid value for stride (Since 1.6)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-STATUS-FONT-TYPE-MISMATCH:CAPS"></a>CAIRO_STATUS_FONT_TYPE_MISMATCH</p></td>
<td class="enum_member_description">
<p>the font type is not appropriate for the operation (Since 1.8)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-STATUS-USER-FONT-IMMUTABLE:CAPS"></a>CAIRO_STATUS_USER_FONT_IMMUTABLE</p></td>
<td class="enum_member_description">
<p>the user-font is immutable (Since 1.8)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-STATUS-USER-FONT-ERROR:CAPS"></a>CAIRO_STATUS_USER_FONT_ERROR</p></td>
<td class="enum_member_description">
<p>error occurred in a user-font callback function (Since 1.8)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-STATUS-NEGATIVE-COUNT:CAPS"></a>CAIRO_STATUS_NEGATIVE_COUNT</p></td>
<td class="enum_member_description">
<p>negative number used where it is not allowed (Since 1.8)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-STATUS-INVALID-CLUSTERS:CAPS"></a>CAIRO_STATUS_INVALID_CLUSTERS</p></td>
<td class="enum_member_description">
<p>input clusters do not represent the accompanying text and glyph array (Since 1.8)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-STATUS-INVALID-SLANT:CAPS"></a>CAIRO_STATUS_INVALID_SLANT</p></td>
<td class="enum_member_description">
<p>invalid value for an input <a class="link" href="cairo-text.html#cairo-font-slant-t" title="enum cairo_font_slant_t"><span class="type">cairo_font_slant_t</span></a> (Since 1.8)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-STATUS-INVALID-WEIGHT:CAPS"></a>CAIRO_STATUS_INVALID_WEIGHT</p></td>
<td class="enum_member_description">
<p>invalid value for an input <a class="link" href="cairo-text.html#cairo-font-weight-t" title="enum cairo_font_weight_t"><span class="type">cairo_font_weight_t</span></a> (Since 1.8)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-STATUS-INVALID-SIZE:CAPS"></a>CAIRO_STATUS_INVALID_SIZE</p></td>
<td class="enum_member_description">
<p>invalid value (typically too big) for the size of the input (surface, pattern, etc.) (Since 1.10)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-STATUS-USER-FONT-NOT-IMPLEMENTED:CAPS"></a>CAIRO_STATUS_USER_FONT_NOT_IMPLEMENTED</p></td>
<td class="enum_member_description">
<p>user-font method not implemented (Since 1.10)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-STATUS-DEVICE-TYPE-MISMATCH:CAPS"></a>CAIRO_STATUS_DEVICE_TYPE_MISMATCH</p></td>
<td class="enum_member_description">
<p>the device type is not appropriate for the operation (Since 1.10)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-STATUS-DEVICE-ERROR:CAPS"></a>CAIRO_STATUS_DEVICE_ERROR</p></td>
<td class="enum_member_description">
<p>an operation to the device caused an unspecified error (Since 1.10)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-STATUS-INVALID-MESH-CONSTRUCTION:CAPS"></a>CAIRO_STATUS_INVALID_MESH_CONSTRUCTION</p></td>
<td class="enum_member_description">
<p>a mesh pattern
  construction operation was used outside of a
  <a class="link" href="cairo-cairo-pattern-t.html#cairo-mesh-pattern-begin-patch" title="cairo_mesh_pattern_begin_patch ()"><code class="function">cairo_mesh_pattern_begin_patch()</code></a>/<a class="link" href="cairo-cairo-pattern-t.html#cairo-mesh-pattern-end-patch" title="cairo_mesh_pattern_end_patch ()"><code class="function">cairo_mesh_pattern_end_patch()</code></a>
  pair (Since 1.12)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-STATUS-DEVICE-FINISHED:CAPS"></a>CAIRO_STATUS_DEVICE_FINISHED</p></td>
<td class="enum_member_description">
<p>target device has been finished (Since 1.12)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-STATUS-JBIG2-GLOBAL-MISSING:CAPS"></a>CAIRO_STATUS_JBIG2_GLOBAL_MISSING</p></td>
<td class="enum_member_description">
<p><a class="link" href="cairo-cairo-surface-t.html#CAIRO-MIME-TYPE-JBIG2-GLOBAL-ID:CAPS" title="CAIRO_MIME_TYPE_JBIG2_GLOBAL_ID"><code class="literal">CAIRO_MIME_TYPE_JBIG2_GLOBAL_ID</code></a> has been used on at least one image
  but no image provided <a class="link" href="cairo-cairo-surface-t.html#CAIRO-MIME-TYPE-JBIG2-GLOBAL:CAPS" title="CAIRO_MIME_TYPE_JBIG2_GLOBAL"><code class="literal">CAIRO_MIME_TYPE_JBIG2_GLOBAL</code></a> (Since 1.14)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="CAIRO-STATUS-LAST-STATUS:CAPS"></a>CAIRO_STATUS_LAST_STATUS</p></td>
<td class="enum_member_description">
<p>this is a special value indicating the number of
  status values defined in this enumeration.  When using this value, note
  that the version of cairo at run-time may have additional status values
  defined than the value of this symbol at compile-time. (Since 1.10)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.0</p>
</div>
</div>
<div class="refsect1">
<a name="cairo-Error-handling.see-also"></a><h2>See Also</h2>
<p>cairo_status(), <a class="link" href="cairo-cairo-surface-t.html#cairo-surface-status" title="cairo_surface_status ()"><code class="function">cairo_surface_status()</code></a>, <a class="link" href="cairo-cairo-pattern-t.html#cairo-pattern-status" title="cairo_pattern_status ()"><code class="function">cairo_pattern_status()</code></a>,
           <a class="link" href="cairo-cairo-font-face-t.html#cairo-font-face-status" title="cairo_font_face_status ()"><code class="function">cairo_font_face_status()</code></a>, <a class="link" href="cairo-cairo-scaled-font-t.html#cairo-scaled-font-status" title="cairo_scaled_font_status ()"><code class="function">cairo_scaled_font_status()</code></a>, 
           <a class="link" href="cairo-Regions.html#cairo-region-status" title="cairo_region_status ()"><code class="function">cairo_region_status()</code></a></p>
</div>
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